TS2472: Spread operator in 'new' expressions is only available when targeting ECMAScript 5 and higher.

[Fodor Zoltan]

• Version: 1.2.34
• Rollup Version: 2.70.1
• Operating System and version (if applicable): ubuntu
• Node Version (if applicable): 12
• Typescript version: 3.9.10
• Does it work with tsc (if applicable): YES

Reproduction

I have a tsconfig with

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "*": ["*", "node_modules/@types/*", "node_modules/*/lib"]
    },
    "module": "es2020",
    "target": "ES2017",
    "sourceMap": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "lib": ["dom", "dom.iterable", "esnext"],
    "allowJs": false,
    "skipLibCheck": true,
    "strictNullChecks": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "strict": true,
    "forceConsistentCasingInFileNames": true,
    "moduleResolution": "node",
    "resolveJsonModule": true,
    "isolatedModules": true,
    "noEmit": false,
    "jsx": "react",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "types": ["node", "cypress"],
    "incremental": true
  },
  "typeRoots": ["node_modules/@types"],
  "include": ["src"],
  "exclude": ["node_modules"]
}

In rollup I have

ts({
   tsconfig: 'tsconfig.json',
}),

And I get this error: [!] (plugin Typescript) TS2472: Spread operator in 'new' expressions is only available when targeting ECMAScript 5 and higher.. Does not matter what target I set, it always fails with this error.

When running npx tsc --noEmit --incremental false separately it works correctly (no errors).

Expected Behavior

Should compile normally.

Actual Behavior

Does not compile and gives tsc error.

[Frederik Wessberg]

Hi there,

Do you have a reproducible example you can share? A minimal code snippet that will produce this behavior? At a glance, this is not something I'm able to reproduce, so I would love to dig into it.

[Frederik Wessberg]

Hi again. I've set up a simple project with just your tsconfig, a simple rollup config, and a file that uses spread syntax inside a New expression, and it works just fine. Here is the repro: https://replit.com/@wessberg/rollup-plugin-ts-new-spread-1#dist/index.js

As such, I don't see that there's a problem with rollup-plugin-ts here, but feel free to prepare a minimal repro and respond back to me here. I'll gladly take another look at it and see if I can help you out.

[Fodor Zoltan]

I have debugged this for so long. I finally found out that it was a package.json config: "browserslist": "> 0.5%, not dead",. And it wasn't even in the direct project, it was a lower nested project having it it.